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Slam-seeking conventions are codified artificial bids used in the card game contract bridge. Bidding and making a small slam (12 tricks) or grand slam (13 tricks) yields high bonuses ranging from 500 to 1500 points. However, the risk is also high as failure to fulfill the slam contract also means failure to score the bonus points for a game ...
A bid of five notrump shows either: Any two aces, or; One ace, and the kings of all suits previously bid by either partner. A bid of a new suit shows first-round control (ace or void) there, but is not compulsory with such a holding. Six of a previously bid suit shows a desire to play there (holding one ace, or the kings of all bid suits).
The Norman scale, where an ace counts as one control and a king as half a control, is the basis of the following responses to the 4NT asking bid: 5 ♣: 0 to 1 controls indicating either (a) no aces or kings, or (b) one or two [citation needed] kings or (c) one ace 5 ♦: 1½ controls indicating either (a) one ace and one king or (b) three kings
In contract bridge, an asking bid is a convention used to seek a slam accurately. There are two types - suit asking bids and notrump asking bids. Constructed by bridge pioneer Ely Culbertson in the 1940s, they have been superseded by other methods; however, one remaining commonly used asking bid is the 5NT Grand slam force.
1 ♥ - 3 ♥ 4 ♣ - 4 ♦. The 4 ♣ bid shows a club control and slam interest. If the partnership has agreed to use Last Train, the 4 ♦ bid indicates extra values (i.e., responder's hand is at the upper end of the strength range indicated by the 3 ♥ bid) and invites partner to continue exploring slam. 4 ♦ does not show a diamond control, although of course responder might have one.
For example, with Axx KQxx Axx KQJ, after partner opens 1D, we respond 1H and partner rebids 1NT, we must bid 4NT quantitative in order to invite slam. Using XYZ, after partner's 1NT rebid, we bid 2C, forcing 2D by partner, and then jump to 3NT, which shows this hand. Thus, we are able to make our slam invitation one level lower.
In contract bridge, a cue bid (also, cuebid or cue-bid) is either a bid of the opponents' suit, or "slam seeking": a slam-investigating bid made during an auction's later rounds that shows control of a suit. Traditionally a cue bid is "slam seeking", but in the early 21st century the usage appears to be giving way to control bid.
XY Notrump gives very good control finding both games and slams, as the final "mission" of the sequence is established at a relatively early stage of bidding. Playing, as very common in combination with XY no trump, the Walsh convention or even Transfer Walsh , one still has the chance of stopping in 2 ♦ on weak hands, often impossible using ...